Settings.Save -> Invalid high surrogate character.

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Hello,

I have a .net 2.0 application using a 'Settings.setti ngs' configuration file
to store application settings. The settings are modified at runtime and
stored when the user exits the application.

Occasionaly, this exception will occur when calling the
Settings.Defaul t.Save() method:

Invalid high surrogate character (0xDE1C). A high surrogate character must
have a value from range (0xD800 - 0xDBFF).
StackTrace: at System.Xml.XmlT extEncoder.Writ e(String text) at
System.Xml.XmlT extWriter.Write String(String text) at
System.Xml.XmlT ext.WriteTo(Xml Writer w) at
System.Xml.XmlE lement.WriteCon tentTo(XmlWrite r w) at
System.Xml.XmlN ode.get_InnerXm l() at System.Xml.XmlE lement.get_Inne rXml() at
System.Configur ation.LocalFile SettingsProvide r.SerializeToXm lElement(Settin gsProperty
setting, SettingsPropert yValue value) at
System.Configur ation.LocalFile SettingsProvide r.SetPropertyVa lues(SettingsCo ntext
context, SettingsPropert yValueCollectio n values) at
System.Configur ation.SettingsB ase.SaveCore() at
System.Configur ation.SettingsB ase.Save() at
System.Configur ation.Applicati onSettingsBase. Save() at
MyApp.frmMain.f rmMain_FormClos ing(Object sender, FormClosingEven tArgs e) in
C:\MyApp\frmMai n.cs:line 159

What could be causing this? Could one of the datatypes that I am serializing
in my settings file produce invalid characters? These datatypes are:

string
bool
int
double
long
System.Windows. Forms.FormWindo wState
System.Drawing. Rectangle
System.Drawing. Point

Any suggestions would be apprecitated.

Chris